About ZeroDay Quiz
ZeroDay Quiz is a free cyber security learning game. It turns security topics into a series of questions, from everyday habits like choosing strong passwords to expert subjects like Active Directory attacks and cloud security.
Every answer comes with an explanation, so you learn why an answer is right, not just whether it is right.
100levels
500+questions
3difficulty tiers
FREEto play
WHAT WE BUILT
100 LEVELSStart with easy questions and climb to expert-level challenges.
DAILY CHALLENGEA new set of questions every day, the same for everyone.
LEARNING ARTICLESPlain-English guides on passwords, phishing, and staying safe online.
WHO IT IS FOR
Students, career changers, office workers, and anyone who wants to test their security knowledge. Beginners start with the easy levels, and experienced practitioners can take on the hard ones.
OUR APPROACH
Questions reflect widely accepted practices, such as NIST frameworks, OWASP guidance, and common certification topics. We update questions when standards change, and we welcome corrections from readers.
This site is for education. The questions and articles do not replace professional security advice. For a real incident, contact a qualified security professional or your IT team.